False twisting machines



July 26, 1960 E. P. R. SCRAGG ETAL 2,946,177

FALSE TWISTING MACHINES 4 Sheets-Sheet 1 Filed Sept. 17. 1956 Inventor:ZI'MFZffi/Q/EMW July 26, 1960 E. P. R. SCRAGG ETAL 2,946,177

' FALSE TWISTING MACHINES Filed Sept. 17, 1956 4 Sheets-Sheet 2 19 I 19lin iiii MW? WW AWN, I

|1"'" I v Hm" 5 m 39 m \i/ A tlomeys.

July 26, 1960 E. P. R. SCRAGG ET AL FALSE TWISTING MACHINES Filed Sept.17, 1956 4 Sheets-Sheet 3 July 26, 1960 E. P. R. SCRAGG ETAL 2,946,177

v FALSE TWISTING MACHINES Filed Sept. 17, 1956 4 Sheets-Sheet 4 InvmtorrA ttorneg;

FALSE TWISTING MACHINES Ernest P. R. Scragg and Austin Dobson,Macclestield, England, assignors to Ernest Scragg & Sons Limited,Macclesfield, Cheshire, England, a British company 7 This inventionrelates to false twisting machines which are employed for crimping orimparting, a so-called false twist to synthetic and like textile yarnsand threads.

An object of the present invention is to provide an arrangement wherein,when the false twisting unit is-moved away from the belt and rotation ofthe spinner unit ceases, an associated feed device feeding yarn orthread to the-false twisting device is also disengaged so that feedingof the yarn or thread also ceases. A further object of the inventioninherent in the construction is to'control theop'eration and thecondition of the yarn or thread by varying speeds of the feed andtake-up.

According to the present invention a false twisting machineischaracterised by the provision, below-a take-up tube resting on aroller whereby it is rotated, of a pair of feedrollers which, in use,are lapped by the yarn or thread, said feed rollers being disposed oneabove and one below the false twisting unit of the machine and eachbeing supported so as to rest on an associated drive roller, wherebyvarying speeds can be imparted to the feed rollers, there beingdisplacement means acting on said feed rollers and the false twistingunit whereby one operation of the displacement means servessimultaneously to displace the false twisting unit away from its drivingbelt and to lift the feed rollers off their associated drive rollers, areverse movement of the displacement means restoring all to their formerpositions and operations. j

A brake may be provided on the unit, which brake serves to arrest therotation of the spinner, the displacement means when operated to movethe unit away from the belt, serving to apply the brake. V

The invention will be described further by way of example with referenceto the accompanying drawings in which: i

I Figs. la and 15 show respectivly the lower and upper parts of a falsetwisting machine constructed in accordance with the invention, in frontelevation; and 7 "Figs." 2a and-2b are corresponding: end views of themachine. 1 g i .A false twisting machine constructed in accordance withthe present invention comprises a plurality of banks, each including afalse twisting unit shown generally at 10, mounted so that it can bemoved into and out of contact with an endless driving belt 11 runninground the machine.

supported upon a vertical post 12, and a helical spring (not shown)surrounding the post 12 and secured respectively to the unit and to thepost 12 serves to urge the unit 10 towards the belt 11 so that thespinner 13 thereof is rotated by the belt 11.

Parallel to and spaced from the post 12 supporting the unit 10 is avertical shaft 14 and this constitutes part of means for displacing thefalse twisting unit 10 away from the belt 11. Midway along each suchshaft 14 is a cam 15, this co-operating with one end of an axially Thefalse twisting unit 10 is conveniently swingably 2,946,177 Patented July26, 1960 displaceable push rod 16, the other end of which engages theunit 10 at a point displaced to one side of the post 12. Thus, when thevertical shaft 14 is rotated about its axis, the cam 15 displaces thepush rod 16 and presses this into contact with the unit 10 to displaceit away from the belt 11 so that the spinner 13 is moved completely outof engagement with the belt 11.

Pivoted one above and one below the false twisting unit .10 are Ubrackets 17, 18, these each supporting a feed roller 19, 20,respectively which rests upon an associated drive roller 21, 22, theaxes of these rollers being substantially horizontal. The drive rollers21 and 22 are driven independently and are capable of varied rotationalspeeds over wide ranges.

Each bracket '17, 18, has near its pivot, a rotatable disc 23. Thevertical shaft 14 already described extends between the limbs of the Ubrackets 17, 18, and a cam 24, 25, is provided at each end thereon,these being disposed so that the rotatable discs 23 on the brackets 17,18,. rest thereon. The arrangement is such, therefore, that uponrotation of the vertical shaft 14, as already described, to move thespinner unit 10 away fromthe Also mounted upon themachine shaft is aheating de vice'26through which thread passes in contact with a heaterplate, (not visible in the drawings) to the spinner tube- 13 so that thethread is suitably heated when it reaches the spinner tube. When thedisplacement means" is operated to stop the rotation of the spinner tube13 and the travel of the thread, the thread is at the same timemoved, by"displacement of the brackets'17, 18 laterally in the heater 26, to takeit out of immediate contact with the heater plate. x

In use, a yarn or thread to have a false twist imparted thereto is fedfrom a bobbin 27 through a suitable tensioning device 28 round thefeedroller 20 below the spinner tube 13, through the heating device 26,is threaded through the spinner tube '13 and then taken over the feedroller 19 disposed above the spinner tube. From the roller 19 the yarnor thread is taken over the guide 30 to the take-up tube 31 resting onthe driven roller 32, on which take-uprtube 31 the yarn or thread iswound into a package: the driven roller 32 is capable of speed variationwhich consequently varies the speed of rotation of the take-up tube.This is done Withthe feed rollers lifted from their drive rollers 21, 22and the spinner tube 13 out of contact with the belt 11. ;The verticalshaft 14 is then rotated, a'suita ble hand lever 29 being provided forthis purpose, so that the adequate tension is imparted to the thread,both as it passes to the spinner tube and from the latter and also speedof take-up.

When the machine is to be stopped, the vertical shaft 14 is rotated soas to lift the feed rollers from their drive rollers, so that the feedof the thread is arrested. At the same time, the spinner tube is movedout of contact with the belt, and the thread now stationary, is movedout of contact with the heater plate thus ensuring that the thread willnot become damaged.

The invention is not confined to the precise details of the foregoingexample and variations may be made thereto, if desired. For example,there could be an electric switch for the heating device associated withthe vertical shaft 14, the switch being operated to switch ofi currentfrom the heating device when the thread feed is arrested. 7 V V pFurther, the push rod lldwhich displaces the spinner unit away from thebelt could be arranged to act through a brake shoe or the like, whichoperates to arrest rotation of the spinner tube when the feed of thethread is arrested.

It is to be understood that by varying the speeds of the feed rollersand the top roller independently, a very exact control over the yarn orthread wound on to the take-up tube can be effected, as for'instance, byincreasing the speed of the bottom feed roller the yarn or thread can berelaxed, or by increasing the speed of the top feed roller a greatertension can be applied or by increasing or decreasing the speed of thetop roller and hence the take-up tube with or without'varying the speedof one or both of the feed rollers, tension or relaxation on the yarn orthread can be eliected after the yarn or thread has been treated in itspassage through the apparatus below.

We claim:

1. In a false twisting machine, in combination, a false twist spindlehaving a vertical axis; support means supporting said spindle forturning movement about a second axis parallel to the spindle axis; ahorizontal drive belt, said spindle being spring urged to turn aroundsaid second axis into engagement with said drive belt to be driven bythe latter; stationary heating means located along the axis of saidspindle when the latter is in driving engagement with said belt forheating a -yarnwhich passes through said spindle; and manually operablemeans cooperating with said spindle for turning the latter at the willof the operator around said second axis away from said belt to stop theoperation of the spindle, the movement of the latter away from said beltalso moving the yarn to a position where it is is not heated by theheating means so that the heating of the yarn also stops when theoperator moves the spindle away from the belt.

2. In a false twisting machine, in combination, a false twist spindlehaving a vertical axis; support means supporting said spindle forturning movement about a second axis parallel to the spindle axis; ahorizontal drive belt, said spindle being spring urged to turn aroundsaid second axis into engagement with said drive belt to be driven bythe latter; a pair of parallel feed rolls respectively having horizontalaxes and respectively located above and below said spindle; a pair ofparallel horizontal drive rolls respectively located beneath said feedrolls; a pair of pivot means respectively supporting said feed rolls forfree turning movement by gravity respectiveiy around a pair ofhorizontal axes downwardlyonto said drive rolls to be driven by thelatter; and a single manually operable means cooperating with saidspindle and said pair of pivot means for turning said spindle aroundsaid second axis away from said belt and for simultaneously turning saidpair of pivot means up.- wardly away from said drive rolls to raise saidfeed rolls out of driving engagement with said drive rollssimultaneously with turning of said spindle away from said belt so as tostop the operation of the spindle and simultaneously stopping thefeeding of yarn therethrough.

' 3. In 'a false twisting machine as recited in claim 2, stationarybearing means located between said spindle and one of said feed rollsalong the axis of said spindle when the latter is in driving engagementwith said belt for heating a yarn transported by said teed rolls throughsaid spindle, the yarn being displaced with respect to said heatingmeans when said spindle is turned away from said belt and said feedrolls are raised awayfrom said drive rolls so that heating of the yarnalso terminates when the operation of the spindle stops.

,4. In a false twisting machine, in'combination, aborizontal drive belt;a vertical false twistspindle; support means supporting said spindle forturning movement about a vertical axis spaced from and parallel to theaxis of the spindle, said spindle being spring urged around saidvertical axis into engagement with said belt to be driven thereby; apush rod perpendicular to said vertical axis and supportedby saidsupport means for movement along a path which will move said spindlearound said vertical axis away from said belt to stop the operation ofsaid spindle; a vertical rod supported by said support means for manualturning movement around its axis; and a cam carried by said vertical rodat the elevation of said push rod for moving the latter when saidvertical rod is manually turned in a direction which will move saidspindle around said vertical axis away from belt;

5. In a false twisting machine as recited inclaini 4, a pair ofhorizontal feed rolls respectively above and be low said spindle forfeeding yarn therethrough; a pair of'drive rolls respectively locatedbeneath said'feed rolls for driving the same; a pair of bracketscarrying saidfeed rolls respectively, said brackets being turnablysupportedby said support means for free turning movement aroundhorizontal axes, respectively, so that said feed rolls are urged bygravity toward said drive rolls to be respectively driven thereby; and apair of additional cams fixedly carried by said manually turnablevertical rod and cooperating with said brackets for turning the latterand said feed rolls therewith upwardly away from said drive rolls whensaid vertical rod is manually turned to actuate said'push rod to movethe spindle away from the drive belt.

References Cited in the file of this patent UNITED STATES PATENTS518,714 Belgium Apr. 15,1953

